docs: def read_local_manifest(output_path):
      """Return the contents of the local manifest, as a dictionary."""
      local_manifest_path = get_local_manifest_path(output_path)
      try:
          with open(local_manifest_path, 'r') as f:
              manifest = dict(get_files_from_textfile(f))
              logging.debug('Retrieving %s elements from manifest', len(manifest))
              return manifest
      except IOError:
          logging.debug('No local manifest at %s', local_manifest_path)
          return {}